10FP4 , How rare is it ?

[Tube TV]

Originally Posted by Eric H

It's just an Aluminized version of a 10BP4, it doesn't use an Ion trap and it'll have a brighter picture than the BP4.
The GE probably had a 10BP4 originally, I believe the FP4 was introduced later as an upgrade but I may be wrong about that.

It says it's a 10FP4 on the tube list , but perhaps it was a later set and they used the 10FP4 in favour of the BP4 .
I dont see any ion trap in the pictures of it , It should be here this week ,I'll know more then .
Whats in the 10T1 Locomotive ? Apperently , it's much the same .