Hi mate. Gaugemaster & Dapol both do rolling stock in O, OO & N gauge, 3 different scales. I'm surprised neither of these companies have gone down the z gauge route for British rolling stock. Both Dapol & Gaugemaster collection are doing fantastic model locos in N gauge of late, with 5 pole motors & all driving wheels. If these 2 companies could transfer these skills to z gauge we could have quality British rolling stock in this scale.
These 2 companies are really leaving Graham Farish behind with regards to N gauge. Farish have lots of new products due for release & have been due for release for years now! It's like they're still trying to sell off old stock first that just doesn't seem to be shifting, before releasing new material! Graham Farish used to be my first choice when buying N gauge rolling stock, but I've virtually given up with them now. I just hope Farish doesn't fold because that'll mean one less N gauge manufacturer! They seriously need to get their fingers out!!
I too have several t gauge train sets, the EWS starter set with 1 loco, oval of track & battery operated controller. I liked this so much that I bought a 2nd EWS loco to add to the set. Since then I've bought 2 of each of the 2 different HST train sets with different sized tracks & done as you've quoted in your post! Vid link below:
https://1drv.ms/v/s!Ak-2LtKBk-iUgjHUOAH_swgKmfRk