Defects

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Operational Failures

These are defects involving rolling stock - things like locomotive power failures, defective brakes, and so on.

Infrastructure Failures

These are defects involving the railway infrastructure - things like signal lamps not working, switches not being thrown or not locking, and so on.

For each type, its chance of being chosen is defined only by the numerator. This makes it easier to add new failure types, as the chance of occurring is relative to the sum of all the other chances.

When an irregularity is chosen, the sim decides (pseudo-randomly) whether the failure will actually occur. If you imagine playing with a pair of dice, you can think of the sim making two rolls: first, to determine which type of failure to attempt, and a second roll, to determine whether the failure actually occurs. Below, the "relative chance of occurring" relates to the first roll of the dice. The second roll depends on the type of failure - some types are more likely to happen under certain conditions. For example, switch obstructions are more likely when it's cold.

SignalOneFilament

Not Currently Implemented.

Relative chance of occurring: 5/x.

SignalAllFilaments

Not Currently Implemented.

Relative chance of occurring: 5/x.

SwitchObstruction

Implemented in Kleinstadt and BETA builds.

Relative chance of occurring: 5/x.

When a switch obstruction occurs, about 5% of the time, it will be obstructed in both the normal and reverse positions. Otherwise, there's an equal probability that it's obstructed in the normal or reverse position. The probability that a switch obstruction is executed is doubled when it is cold.

To resolve, a technician must be called.

SwitchDefectiveEndContact

Implemented in Kleinstadt and BETA builds.

Relative chance of occurring: 5/x.

When this type of failure occurs, about 5% of the time, it will be happen with both the normal and reverse end contacts. Otherwise, there's an equal probability that it's obstructed in the normal or reverse position.

To resolve, a technician must be called.

SwitchOutOfCorrespondenceAfterTrain

Not Currently Implemented.

Relative chance of occurring: 5/x.

LampIsDefective

Relative chance of occurring: 5/x.

TrackOccupationSpontaneous

Relative chance of occurring: 5/x.

TrackOccupationAfterTrain

Relative chance of occurring: 5/x.

ExitLockLightPersistence

Not Currently Implemented.

Relative chance of occurring: 5/x.

CatenaryGroupFailure

Relative chance of occurring: 5/x.

PanelLightDefect

Implemented in GENERIC and BETA builds.

Relative chance of occurring: 5/x.