The EN50155 standard for rail computers
EN50155 applies to all electronic equipment installed on rail vehicles and associated with either the accumulator battery of the vehicle of the low voltage power supply source with the exception of the electronic power circuits which conform to EN50207.

Products covered by these areas are deemed as those which consist mainly of semiconductors which are housed on printed circuit boards which of course covers our rail certified computers, panel PCs and displays.
What areas does EN50155 cover?
There are four areas of EN0155 product standards which need to be considered with rail certified computers for rolling stock. These are:
Environmental: Cooling, dry heat and vibration, shock and bump tests
EMC: EN51021-3-2 & EN50121-4 (track side)
Safety: Insulation testing
Performance: Supply variations and supply Interruption
Optional EN50155 tests
EN51055 also specifies some optional tests and conditions which can be deemed necessary by agreement between the end customer and the vendor. These cover areas such as conformal coating for PCBs and also salt mist spray tests at varying lengths of exposure.

These tests and conditions are intended to prevent deterioration or damage due to moisture and atmospheric contaminants which could cause damage to the PCB or the chassis itself.
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