Another TPWS Question

[PJW]

Dear Peter,

What are the legend of TSS and OSS?

Should the field equipment need to be shown in the layout as an answer to the module 2 of IRSE examination?

Regards,

Henry

TSS = Train Stop System
OSS = Over Speed Sensor (but to be honest sensor is not what I'd call it)
TSS at the signal, set to intervene whatever the train speed
OSS on the approach to signal or bufferstop with a set speed determined by the spacing of the loops and acts as a speed trap for a train crossing the loops above that speed if loops are active.

I would show for bay platforms approaching buffers (because most layouts would only have one or two) but certainly not waste time showing on every signal. Cover by general note as advised in Study Pack and see some posts in Module 2 layouts section where students have suggested some phrases that they intend to utilise