2009 CTs: State Railway of Thailand practice

[PJW]

The Point Control Table also differs a bit from the standard UK or IRSE Control Table; I must admit that I think I actually prefer it (perhaps because more like the old Western Region ones!).

I do find the "diagonal" nature of modern UK CTs annotated N>R and R>N with the locking being converse to the calling can be confusing to some; here there are seperate columns for setting Normal and setting Reverse but the locking for whichever direction is all in one separate list. Probably more appropriate to a relay interlocking (or CBI based very much on the same interlocking approach) with one combined "loc function" rather than for SSI using separate "pfm" data for the two separate directions.

There is no specific columns for Time of operation or swingiing overlap controls; neither is there a usefully wide remarks column so if this sort of locking were needed then it would have just to be cross referenced in the table itself and squeezed in the none too generous area at the bottom above the border grid boxes. If using this as a blank in the exam then I would photocpy this format but with the bottom area all covered up- both to make more anonymous and also to give mre area to utilise for adding details of types of locking that do not happily fall into any of the standard boxes

Since the files are quite large, I cannot attach all to this same post but will do so in a succession of subsequent posts.