RRB ALP has the longest selection process in Railway recruitment — four stages, one of which most candidates have never heard of until they reach it. The Computer Based Aptitude Test, taken only by Assistant Loco Pilot candidates, has no negative marking and cannot be prepared for with content; it tests reaction time, concentration and depth perception. Meanwhile the written stages weight General Science more heavily than any other Railway exam. This guide covers all four stages, eligibility and where preparation actually pays.
Key Points (Quick Revision)
- ALP = Assistant Loco Pilot, the entry post toward becoming a train driver.
- CBT 1: 75 questions, 60 minutes — Mathematics, Reasoning, General Science, General Awareness.
- CBT 2 has two parts: Part A (common) and Part B (trade-specific, qualifying only).
- Stage 3 is the Computer Based Aptitude Test — psychometric, not academic.
- Requires 10th pass plus ITI or a diploma in a relevant engineering trade.
What an Assistant Loco Pilot does
An Assistant Loco Pilot works alongside the Loco Pilot in the engine, assisting with train operations, signal observation and basic troubleshooting. The post is the first rung of a defined career ladder that leads to Loco Pilot for goods trains, then passenger trains, and eventually mail and express services.
The work involves shift duties, long hours away from home base, and considerable responsibility, since the crew is directly accountable for the safety of the train. That responsibility is precisely why the selection process includes a psychometric aptitude test and a strict medical standard that other Railway posts do not have.
The four stages of selection
| Stage | What it is | Counts toward merit? |
|---|---|---|
| CBT 1 | Screening test, 75 questions in 60 minutes | No — qualifying only |
| CBT 2 | Part A (common) and Part B (trade-specific) | Part A yes; Part B qualifying only |
| CBAT | Computer Based Aptitude Test — psychometric | Yes, weighted with CBT 2 |
| Document Verification and Medical | Includes strict vision standards | Qualifying |
Two things in this table decide how you should plan. CBT 1 is only a screening filter, so clearing it comfortably matters more than maximising it. And Part B of CBT 2 is qualifying only — you must pass it, but pushing beyond the qualifying mark earns nothing extra toward merit.
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CBT 1 and CBT 2 — where General Science sits
CBT 1 has 75 questions in 60 minutes, drawn from four areas: Mathematics, General Intelligence and Reasoning, General Science, and General Awareness on current affairs. Negative marking of one-third of a mark applies.
General Science here covers Physics, Chemistry and Life Sciences at roughly Class 10 level. For ALP candidates this is friendly territory, because most of them come from an ITI or diploma background where these subjects are already familiar ground.
CBT 2 Part A covers Mathematics, General Intelligence and Reasoning, Basic Science and Engineering, and General Awareness on current affairs. The Basic Science and Engineering portion is broader than school science — it includes engineering drawing, units and measurements, mass and weight, work power and energy, speed and velocity, heat and temperature, basic electricity, levers and simple machines, occupational safety and environmental education.
CBT 2 Part B is trade-specific, based on the ITI trade or diploma you qualified with. It is qualifying at 35 percent and its marks do not add to the merit list. Confirm the exact question counts and qualifying percentages from the current notification, since the Boards have revised these between cycles.
CBAT — the stage you cannot study for
The Computer Based Aptitude Test is taken only by candidates who have opted for the Assistant Loco Pilot post, and it is genuinely different from everything before it. It is a psychometric test measuring intelligence, personality traits, memory, concentration, depth perception and reaction speed — the qualities that matter in a locomotive cab.
Three rules make it unusual. There is no negative marking. Candidates must score a minimum in every single test battery, so a strong performance in one cannot rescue a weak one in another. And the CBAT score is weighted alongside CBT 2 in the final merit, so it is not merely qualifying.
You cannot prepare for it with syllabus content, because there is no content. What you can do is practise sample batteries so the format and pace are familiar on the day, ensure you are properly rested, and understand the instructions before starting. Candidates who see the format for the first time in the exam hall lose marks purely to unfamiliarity.
Note also that the medical standard for ALP includes A-1 vision requirements, which are stricter than for most other Railway posts. Check them before investing months in this exam.
Eligibility and how to prepare
The educational qualification is a Class 10 pass or equivalent, plus an ITI certificate in a relevant trade from an institution recognised by NCVT or SCVT, or a diploma in Mechanical, Electrical, Electronics or Automobile Engineering. The relevant trades are listed in the notification and matter directly, because CBT 2 Part B is set on your trade.
For preparation, weight your time by what actually counts. CBT 2 Part A and CBAT decide the merit, so they deserve the most attention, while CBT 1 and Part B only need to be cleared safely.
Begin with General Science, since it appears in both CBTs and your trade background already supports it. Work from Class 9 and 10 textbooks rather than competition guides, then move to the Basic Science and Engineering topics specific to CBT 2 Part A.
Keep General Awareness focused and light — current affairs of the last six months plus a one-page railway GK sheet covering zones, headquarters and milestones. Add daily timed practice for Mathematics and Reasoning, where accuracy matters more than speed because of the negative marking.
Finally, take at least a few CBAT sample batteries well before the exam. It costs a few hours and removes the single biggest avoidable risk in this process. Candidates preparing for RRB NTPC or RRB Group D share most of the science and awareness base, so the same effort covers several Railway exams.
Frequently Asked Questions
What is CBAT in RRB ALP?
The Computer Based Aptitude Test is the third stage, taken only by Assistant Loco Pilot candidates. It is psychometric rather than academic, measuring memory, concentration, depth perception and reaction speed. There is no negative marking, but you must clear a minimum in every test battery.
What is the eligibility for RRB ALP?
A Class 10 pass plus an ITI certificate in a relevant trade recognised by NCVT or SCVT, or a diploma in Mechanical, Electrical, Electronics or Automobile Engineering. The trade matters because CBT 2 Part B is set specifically on it.
Do CBT 1 marks count in the final merit?
No. CBT 1 is a screening stage only. The final merit is based on CBT 2 Part A and the CBAT score. CBT 2 Part B is also qualifying at 35 percent and does not add to the merit.
How much General Science comes in RRB ALP?
General Science appears in CBT 1 at roughly Class 10 level, and CBT 2 Part A extends it into Basic Science and Engineering covering units, work power and energy, heat, basic electricity, levers and simple machines. It is the largest content area across both stages.
Is the medical test strict for ALP?
Yes. Assistant Loco Pilot requires A-1 medical standards including strict vision requirements, because the role involves reading signals and operating a locomotive. Check the standards in the notification before beginning preparation, since they are stricter than for most other Railway posts.