For anyone in Europe who is looking for a good 18v power supply, I thought that I would mention the Conrad BV01 150VA transformer.
I'm using a bank of these to power my TPC units, and they are both high quality, and good value for money.
They have both 9v and 18v taps, and besides a thermal overload cut-out, they have an extremely fast acting circuit breaker for short-circuit protection.
I've fitted all of mine with the Lionel power adaptor lead, which provides an additional fused connection and the correct plug for fitting a TPC cable, power master or direct lock-on.
To ensure correct phasing, I remove the euro 2-pin connector and fit a UK 3-pin plug. That way I can use 2 of them in a TPC-300 without having to worry if the plug is in the right way around.
They appear to be visually the same as those available from Weissmann, but at a considerably lower cost. You can get them direct from the Conrad web-shop (UK, FR, NL and DE.) and the cost of the 150VA model is under £100 with free shipping. (Note: on the UK website the picture for the BV01 shows the BV03 70VA model, but they look the same.)
I hope that this may be of some help. I have no connection with Conrad, apart from being a happy customer.