I've identified the addressing problem. The Roco treats addresses in the range 100-127 as long addresses. My locos had their addresses assigned to decoders by another DCC system which assigned them correctly as short addresses (ie < 128 as per NMRA) so the Roco could not address the locos until the addresses had been re-assigned by the Roco system as long addresses. Once I reprogrammed the addresses on the Roco the locos became addressable and operable again. Just another DCC quirk (USA v European manufacturers different and incompatible specs and interpretation of NMRA specs). DCC is so 1970s technology, built upon 1970s electronics. It's due a refresh IMHO. Anyway thanks to the Multimaus cab the Z21 is now functioning and useable but I'll be avoiding the touch screen phone app for shunting operations.
They are all 4mm or 00n3 gauge, at one stage i had plans to build an IoMR based layout for them all to run on, but I got somewhat side tracked with the project so it has no progressed for a couple of years.
The radial trucks are based on the London Road Models ones for their LNWR radial tanks and the gearbox started out as a High Level Slimliner but now has been on a serious diet and got new sideframes. The springing does bear on the trucks as you can see in this photo.
And this is where we stand now
dont ask, i have specific reasons for this strange method of building
small Attic , It just fits 2 x 9x5 boards and a short mid section with an extra few meter runs both sides in holes in walls into small side attics. 2 levels built, 3rd is planned
Track = >100 metres peco 100 track all mostly laid, star shape bus, 2.5 and 1.5 twisted bus, block wiring, two rail isolated gaps, 7 metre bus runs including track, too many insulfrogs , 80% of layout is wired above board, due to low ceiling and it being kids layout, while I sorta understood 'power divisions' and the difference x circuit breakers and then track occupancy requirements, as most is manual, i'v left all that to the latter part of the build, which is where I am now at, i use sand to level tracks and underlay for ballest
when i get the next section of track layed i will upload it to IRM
The Next Train to arrive on Platform One is the 1723 service to River Nore. Calling at River Nore only! This service is formed of 3 coaches. Please remain behind the yellow line until your train has came to halt & allow passengers to alight before trying to board.