Changing Headlights

[Signalman]

G'day again,
I forgot to ask you a couple more questions.
1. How do I remove the body of the 2 diesel locos below to replace the both headlights.
2. Can they be replaced with "Constant Current Controlled White LED's.
3. How can I replace the headlight on the USRA 0-6-0 Loco.

Item No. 60301, HO GP40 Diesel Loco - DCC Equipped, "Union Pacific"
Item No. 60348, HO GP40 Diesel Loco - DCC Equipped, "Alaska"
Item No. 50701, HO USRA 0-6-0 W/Smoke, Vanderbilt Tender, "Union Pacific"

Many thanks.

Col Paton.

[the Bach-man]

Dear Col,
To remove the GP-40 shell, simply pry off the fuel tank, which reveals the screws that hold on the shell. I don't have an 0-6-0 handy, but as I recall there's a screw under the boiler front that holds it on.
Have fun!
the Bach-man