Here are some words of the man himself from what has been spoken on the SimSig forum:bluecont said:By the looks of it that's Tre-Sim, the version of SimSig made for Network Rail (or who ever it is now). As Geoff M has said (and has been repeated many times no doubt) he is under contractual agreement not to release any IECC he has produced for Network Rail, but he can upgrade the panels he has already released.
Basically Tre-Sim has produced all the IECCs I believe, which means at this time there will never be any new panels released for SimSig which are IECCs.
For the record, these are the computerised signalboxes I know of:
York (inc Leeds)
Temporary screen for St Pancras
Stratford ('C' I think it's called)
Dartford / North Kent (at Ashford)
Parts of the WCML
Alcatel/Ansaldo (can't remember which):
IECCs and GETR are definitely out. The WestCADs are pretty simple and boring. Bournemouth is pretty quiet as well (small area).