Nice one Tramp, some of the old Triang stuff is very well made, all metal and solid locomotives, or at least even if the body is plastic odds are the chassis will be metal. It depends on the age 
You'll find that the old loco's will run on the same track as the modern loco's as well as being able to use the same power supply with the older track, so long as you have either a power connector for the track or the piece of track you'd normally attach a power supply to. If you don't you could always solder some wires to the underside of a convenient piece to run to your hornby power supply/controller
You'll find that the old loco's will run on the same track as the modern loco's as well as being able to use the same power supply with the older track, so long as you have either a power connector for the track or the piece of track you'd normally attach a power supply to. If you don't you could always solder some wires to the underside of a convenient piece to run to your hornby power supply/controller
Happily collecting things all my life... 