NCC U2 class?

Can anyone confirm that this is a U2 class 4-4-0? If not then what is it?

It looks like a U2, but I'm puzzled by the number which appears to be "4A".

 

I think it maybe Class A 4-4-0.
https://transportsofdelight.smugmug...LWAYS/NORTHERN-COUNTIES-COMMITTEE/i-VpLD7n6/A
or maybe a U1
https://transportsofdelight.smugmug...LWAYS/NORTHERN-COUNTIES-COMMITTEE/i-cQ99W5n/A

 

I'm pretty certain that it's a U1. A picture of a U1 and a U2 together is on page 18 of The LMS in Ireland by Mark Kennedy.

 

Thanks, both. I agree, it's a U1. Wikipedia's Steam Locomotives of Ireland page shows the U1 as having NCC numbers 1-4. Not sure where the "A" suffix comes from, but other U1 photos also show an "A" suffix.

 

Some railways had a duplicate list and locos on that would have a prefix or suffix to the number. Perhaps that's the case here.

 

Makes sense. Thanks for the help.

 

NCC No.4A was a U1 Originally No.4 Glenariff It was renumbered in May 1947 to make way for delivery of class WT 'Jeep' No.4

4A was scrapped April 1949 with 575,417 miles behind it.

(Ref Locomotives Of The LMS NCC and its predecessors William Scott Colourpoint Books 2008)

 

Many thanks for this info. Makes perfect sense now.