Microlearning · Rail operation
Five open doors
One case, three modules, in any order.
These microlearnings build on the case note “Five open doors” and are written for technical writers and manufacturers. Each module takes up one focus of the case: isolating a protective function, the display in the cab and degraded operation. You can start with any module.
- 3 modules, about 7 minutes each
- 4 questions with feedback in each
- No sign-in; answers are not stored
Case brief: the case in short
- Operator’s control (maintenance controller and duty control manager)
- Signaler
- Isolating switches EBS (brake circuit) and TIS (traction interlock), vertical when normal
- Light “safety systems isolated”
- Door interlock indicator on the driver’s desk
- Leading cab
- Rear cab
- Doors on the platform side
- Driver
- Conductor
On 3 May 2023 a three-car regional train stops at Styal station in North West England. After the doors are closed, the brakes do not release. The same fault had occurred on this unit on 24 April; the depot had not found it and had released the unit back into service.
The maintenance controller guides the driver through fault finding by phone. The driver isolates two safety systems, the brake circuit (EBS) and the traction interlock (TIS). With the TIS isolated, the door interlock is out of action. The brakes still do not release.
During fault finding doors are opened, two by the driver and three by passengers getting off. At 15:24 five of the six doors on the platform side are open. At a final attempt the brakes release, and the train moves off without dispatch. A low speed relay closes the doors at 3.1 mph (5 km/h). The conductor is left behind on the platform. No one was hurt.
Later the fault was traced to the leading cab. According to the report, the brakes at Styal would have released from the rear cab.
Basis: report 07/2024 of the Rail Accident Investigation Branch (RAIB), as retold in the case note. The drawing is my own simplified top view and shows the situation at 15:24.
Three modules
Each module stands on its own, with its own scene, four questions, a transfer and a summary. The order 1, 2, 3 follows the course of the case, but it is not required.
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Isolating is not securing
Why an isolation in service works the other way round from lockout/tagout, which rules take the place of lock and tag, and what still protects after the TIS is isolated.
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What the cab showed
What the “safety systems isolated” light reports and what it does not, why an indicator that is always dark cannot report anything, and how habit takes the place of a missing reply.
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When the automatic systems no longer help
What an instruction needs when its last step does not work, what takes the place of the technology after an isolation, and which link of the chain each of the three scenarios addresses.
How this series is built
The three modules are a work sample in learning and information design. They follow the structure of the first microlearning, “Power off does not mean energy-free”, and divide a more complex case into three learning outcomes.
- One case, three learning gaps. The Styal case has three focal points: isolation, display and degraded operation. Each module deals with exactly one of them, so that each outcome can be reached in about seven minutes (segmenting after Mayer).
- Any order. Each module activates prior knowledge with its own scene. Starting with module 3 does not require module 1.
- For technical writers and manufacturers. The questions check what information about protective functions, displays and fallback modes has to achieve. The transfer tasks refer to your own documentation.
- One whole, real task. As in the first microlearning, scene, voices, questions and transfer follow Merrill’s First Principles of Instruction and Gagné’s sequence. The outcomes state audience, behavior, condition and degree (ABCD) and sit at the levels understand, analyze and apply in Bloom’s taxonomy. Each question checks exactly one outcome.
- New: matching tasks. They check relationships instead of single facts, for example between the elements of lockout/tagout and the rules for an isolation. Without JavaScript, task and solution remain readable as lists.
- Feedback in two stages, usable by everyone. After the first mistake a hint with the place in the case note, after the second the solution. Keyboard operation, feedback never by color alone, reduced motion and a readable version without JavaScript follow Universal Design for Learning.
These microlearnings do not replace instruction. Procedures, instruction and supervision in rail operation remain with the operator.
Source
Report 07/2024 of the British Rail Accident Investigation Branch (RAIB), “Unsafe movement of a train at Styal station, 3 May 2023”, as retold in the case note “Five open doors”. Roles, quotes and drawings are my own. The voices are fictitious roles at another operator and at a train manufacturer, not people involved in the case.