Train Driver Medical Requirements UK: The Complete Guide

The Legal Framework

The rules a train driver medical must satisfy live in Schedule 1 of the Train Driving Licences and Certificates Regulations 2010 (SI 2010/724). They trace back to EU Directive 2007/59/EC and were carried into domestic law after Brexit. Sitting above the doctors is the Office of Rail and Road (ORR), the body that issues driving licences, keeps the list of approved examiners, and holds the power to suspend or pull a certificate where the medical standards are not met.

The measurable clinical figures behind those rules — the numbers for vision, hearing, heart, nervous system and metabolism — are published separately by the RSSB as standard RIS-3451-TOM, and every examining doctor works to them. A refresh of that standard has been in progress since 2024, with colour vision testing and diabetes among the areas expected to change.

One point catches applicants out: the examining doctor has to be ORR-recognised specifically, not simply any occupational health physician. The ORR keeps a searchable register of who qualifies. In practice operators route candidates through their own occupational health suppliers, but unless the doctor signing you off holds ORR recognition, the resulting certificate does not stand.

• ✓Governing law — Schedule 1 of the Train Driving Licences and Certificates Regulations 2010
• ✓Regulator — the Office of Rail and Road (ORR), which licenses drivers and can revoke certificates
• ✓Clinical thresholds — set out in RSSB standard RIS-3451-TOM, revised since 2024
• ✓Examiner — only a doctor holding formal ORR recognition, not a general occupational health physician

Vision Standards

The distance-sight figures are precise and leave little room for negotiation. Corrected, your stronger eye has to hit 6/9 (Snellen) or better and your weaker eye 6/12 or better. Separately, each eye must manage at least 3/60 with no correction at all — so a very heavy short-sight prescription can still bar you even when your glasses bring you up to standard. Close and mid-range vision has to reach N8 using both eyes, with or without correction.

Both spectacles and ordinary contact lenses are permitted, and plenty of serving drivers wear them. What the cab does not allow is tinted contacts or photochromatic (light-reactive) lenses; a plain UV filter is fine. There are also prescription ceilings — up to +5 dioptres of long-sight and -8 dioptres of short-sight — beyond which a specialist opinion is needed before any further assessment.

Anyone applying fresh needs sight in both eyes. A qualified driver who later loses vision in one eye is not automatically finished — their case is looked at individually to decide whether they can carry on, which makes this one of the genuinely discretionary areas rather than a flat exclusion for existing licence holders.

• ✓Corrected distance acuity of 6/9 or better in the stronger eye (Snellen)
• ✓Corrected distance acuity of 6/12 or better in the weaker eye
• ✓Unaided vision no worse than 3/60 in either eye
• ✓Binocular near vision reaching N8 or better
• ✓Glasses and standard contact lenses allowed; tinted and light-reactive lenses are not
• ✓Prescription ceilings of +5 dioptres for long-sight and -8 dioptres for short-sight

Colour Vision — The Most Common Disqualification

No single requirement fails more applicants than colour vision. The bar is genuinely normal colour perception — not just workable or good enough — because a driver has to read signal lamps, marker lights and operational indicators correctly every time. It is markedly tougher than car or HGV licensing, neither of which sets any colour vision test at all.

Screening starts with the Ishihara plates. Fail those and you move to a confirmatory assessment, usually the Farnsworth-Munsell 100-hue, the Farnsworth D-15 or the City University Colour Vision Test. The common red-green losses — protanopia, deuteranopia and pronounced protanomaly or deuteranomaly — fail Ishihara and end the process. Mild deuteranomaly is the exception that sometimes survives the confirmatory stage. Blue-yellow deficiency (tritanopia, tritanomaly) is much rarer, need not touch the signal-relevant colours, and is judged individually.

If you have any suspicion that your colour vision is off, get it checked privately before you apply. Finding out at the assessment-centre medical costs you both the day and your slot in that intake.

• ✓Full, normal colour vision is the standard — screened first with Ishihara plates
• ✓An Ishihara fail sends you to a confirmatory test before any decision is made
• ✓Red-green losses — protanopia, deuteranopia, marked protanomaly or deuteranomaly — will not pass
• ✓Slight deuteranomaly is the grey area; some candidates clear the confirmatory stage
• ✓Blue-yellow deficiencies (tritanopia, tritanomaly) are judged on an individual basis
• ✓If in any doubt, pay for a colour vision check yourself before you apply

Hearing, Cardiovascular and Neurological Standards

Hearing is checked with pure tone audiometry. In the poorer ear, loss cannot go beyond 40 dB at 500 Hz and 1,000 Hz, or beyond 45 dB at 2,000 Hz. The real-world test is whether you can follow a phone call and pick up cab radio traffic and warning tones without difficulty. Hearing aids are fine so long as they pull you back inside those limits.

A reading over 160/100 mmHg on the examination day has to be looked into before any fit certificate is signed, though hypertension kept in check by medication is generally accepted once the numbers fall into range. A resting ECG is compulsory at the first medical and then repeated every year for anyone 40 or older. Serious arrhythmias, heart failure and uncontrolled angina all disqualify, while a return to duty after a cardiac event is weighed individually against left ventricular function and exercise capacity.

Few standards are as unforgiving as the one for epilepsy. A seizure history reaching back to childhood is disqualifying — a bar set well above the HGV standard and far above what car driving requires. A one-off unexplained collapse in adult life has to be fully investigated, with safety-critical work paused until the cause is pinned down. Vasovagal fainting tied to a clear, avoidable trigger can sometimes be accepted after individual review.

• ✓Hearing loss capped at 40 dB across 500–1,000 Hz and 45 dB at 2,000 Hz in the poorer ear; aids allowed
• ✓Resting blood pressure under 160/100 mmHg, including where medication keeps it controlled
• ✓A resting ECG at the first exam, then repeated every year once you turn 40
• ✓A childhood-onset history of epilepsy rules you out — a far tighter bar than HGV licensing
• ✓Any blackout of unknown cause halts safety-critical duty until the cause has been fully investigated

Mental Health — Not Automatically Disqualifying

A mental health diagnosis does not automatically shut the door — and this is the part of the framework applicants misread most often. Each case is judged individually by the ORR-recognised doctor, working with the driver's own clinician and the operator's occupational health team. What matters is not the label on the diagnosis but whether the condition, or the treatment for it, is currently getting in the way of safety-critical performance.

One episode of depression that has fully lifted and not returned is usually no barrier, provided the person is stable and off sedating medication. Well-managed mild-to-moderate anxiety that leaves concentration and judgement intact is looked at individually. Being on an SSRI or SNRI — sertraline, fluoxetine, venlafaxine — does not rule you out; because the assessment turns on how you actually function, the particular drug matters far less than your real cognitive performance.

The conditions that more reliably disqualify are active psychosis, severe bipolar disorder with psychotic features, significant personality disorders affecting impulse control or judgement, and active substance use disorders. PTSD gets specific attention in rail work because drivers are exposed to fatality incidents; rather than treating the diagnosis as a permanent bar, operators are obliged to bring affected drivers back through a supported, structured return-to-duty route.

• ✓No diagnosis is an automatic bar — mental health is weighed case by case
• ✓A one-off bout of depression that has fully cleared is usually no obstacle
• ✓SSRIs and SNRIs are judged on how you actually function, not by banning specific drugs
• ✓Active psychosis, severe bipolar disorder and active substance use are the likelier bars
• ✓Post-incident PTSD is handled through a supported, structured return to duty

Diabetes and Medications

Type 2 diabetes held in check by diet, metformin or non-insulin agents (SGLT-2 inhibitors, GLP-1 agonists) passes with the usual occupational health assessment. Insulin — whether for Type 2 or Type 1 — is not an automatic exclusion either: there are documented insulin-dependent drivers holding valid Train Driving Licences, provided their HbA1c stays within limits, they avoid problematic hypos, they retain good hypo awareness, and they sign up to a monitoring protocol. What does disqualify is poorly controlled diabetes bringing eye complications or frequent hypoglycaemia.

No official blacklist of medications exists. The judgement is functional: if a drug is likely to blunt safety-critical performance while you are taking it, it disqualifies. Off-limits during use are opioid painkillers, benzodiazepines (prescribed sleepers such as zopiclone and temazepam included), strongly sedating antihistamines, antipsychotics and antiepileptics. Non-drowsy antihistamines, most heart and blood-pressure drugs, and many antidepressants generally pass, subject to individual review. If you take anything regularly on prescription, raise it with an ORR-recognised doctor before you apply.

• ✓Diet-controlled or tablet-managed Type 2 diabetes clears with the standard assessment
• ✓Insulin use, whether Type 1 or Type 2, is reviewed individually rather than barred outright
• ✓The insulin criteria: in-range HbA1c, no troublesome hypos, and an agreed monitoring plan
• ✓Barred while being taken: opioids, benzodiazepines, sedating antihistamines and antipsychotics
• ✓Usually fine: SSRIs, non-drowsy antihistamines and the bulk of cardiovascular medicines
• ✓Disclose everything you are prescribed — a valid prescription at therapeutic levels is assessed, not auto-failed

Drug and Alcohol Testing

Alcohol limits on the railway sit well below those in road traffic law. The Transport and Works Act 1992 draws the legal line at 80 mg per 100 ml of blood, but the industry has voluntarily adopted an operational limit of 29 mg/100 ml — roughly a third of the road threshold. The breath equivalents tell the same story: 35 µg/100 ml on the road against 13 µg/100 ml on the railway.

The drug screen looks for cannabis (THC), cocaine, opiates, amphetamines, MDMA, benzodiazepines, tramadol, ketamine and methadone metabolites. It happens on three occasions — before employment (compulsory at the first medical), for cause (after an incident or where there is reasonable suspicion), and at random, with operators required to test a minimum of 5% of safety-critical staff each year and many going further. An unprescribed positive triggers an ORR licence review. Prescribed medication showing at therapeutic levels with a valid prescription is not failed automatically, but the occupational health assessment still asks whether that drug is compatible with safety-critical duty.

• ✓Blood alcohol cap of 29 mg/100 ml — about a third of the 80 mg/100 ml road figure
• ✓Breath alcohol cap of 13 µg/100 ml against the road limit of 35 µg/100 ml
• ✓Screened drugs span cannabis, cocaine, opiates, amphetamines, MDMA, benzodiazepines, tramadol, ketamine and methadone
• ✓Test points: at hiring, after an incident or on suspicion, and randomly (at least 5% of staff yearly)
• ✓An unprescribed positive result sends your licence to the ORR for review

Frequency of Periodic Medicals

You clear the full initial medical before a Train Driving Licence is issued, and from there the medicals recur across your whole career: no less than every three years while you are under 55, then every year once you reach 55. Operators are free to examine more often under their own internal policies.

Coming back to safety-critical work after a long spell of illness or injury — or after any incident that puts your fitness in question — means an unscheduled review first. If a periodic medical is failed, the operator has to report it to the ORR, and the licence can be suspended while the matter is worked through.

If you fall short of the standards today, it is worth establishing whether your condition is permanent, treatable or simply manageable. Plenty of drivers who were initially blocked have returned to the cab after effective treatment, because the framework is an ongoing fitness assessment rather than a one-off gate.

• ✓First full medical must be passed before the Train Driving Licence is granted
• ✓Drivers below 55 are re-examined at least once every three years
• ✓From 55 onwards the medical becomes an annual requirement
• ✓A serious illness or injury triggers an extra review before you can drive again
• ✓Any failed periodic medical is reported to the ORR and can suspend the licence