I banished them.....
Dan.
The only places they exist on my outdoor layout is on some loops/sidings on two shuttle type branches, where Thomas never goes. The mainline is mostly LGB R3 with one bit of R2 where space dicated nothing else would do.....
However when a chum and I do temporary layouts at shows we sometimes include them. Most basic RTR stock will cope with them well and without issue, except Thomas and co. That said with the modifications to the couplings I mentioned Annie and Claribelle and other TTE LWB stock will, but the short wheelbase stock is still not happy....
Pity, as I have said many times - TTE is supposed to be a toy and surely if it was really a toy a child of a suitable age should be able to set it up how they want and play with it, unsupervised, like I did with my Hornby '0' gauge.
You should not need to be a mini Brunel or Einstein to work out what will work and what won't. It is a toy!
My final whinge on this is that Bachmann sell something very similar to LGB R1 in all their TTE train sets, including the Xmas one, but you should hear that Xmas coach squeal as poor Thomas tries to drag it around those R1 type curves!