can the output a 250 watt transformer be paralled to the two input output terminals of the tiu with the two outputs going to two different layouts?
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Yes,
put inline 10 amp fuses at each input. put the wires to channel one and jump to channel two. send the outputs where you want.
I still would use a separate power wart for the TIU's power.
ironlake, your description is a little unclear, but I will say this: never connect two hot outputs from a transformer in parallel to the same load, for example, to the same TIU input. You may overheat the transformer secondary winding. Perfectly ok to connect different transformer hot outputs to separate TIU circuits, or jumper one transformer hot output to several TIU inputs.
The description seems pretty clear. He's paralleling two inputs from one 250 watt transformer and using the outputs on two different layouts. Works fine as far as I can see, I do something identical.
GRJ, ironlake's use of the word "paralled" gives me some pause, as his sentence can be read in a few different ways. But surely you do not disagree with what I said?
OK jump the two inputs from one source fed by one 16 gauge hot and one 16 gauge ground. My source is a lionel z which has a great amount of power. The outputs would feed two different layouts.
ironlake, I think I read you as saying a single hot wire from the Z to one red input and then jumpering that to another red input. if I were doing it, I'd run a lead from one hot output to one TIU input terminal, and a separate lead from the other hot output to another TIU input terminal, and then feed each layout from its own output. This is to reduce the current through each finger inside the transformer, and permit individual adjustment of voltage on each layout if needed.
If layouts are large, I'd use 14 gauge.
The Z was/is a fine transformer, but as Joe suggests, I'd use a breaker or fuse in each feed because the internal breaker is unreliable.
I think GRJ & I agree on the above.
Sounds good to me. 
