This is a good example of the loco tender 6 wheel power plant for your tired loco. It may be best for you to enquire what savings may be possible.
HORNBY STANIER BLACK 5 LOCO CHASSIS AND BRIGHT BLACK MAIN WHEELS
Hornby R3494 Stanier Black 5 (5MT) BR Unlined Freight Black WORKING, UNUSUAL
PHOTO STANIER BLACK 5 44758 CARNFORTH JUNE 1968 AN EVERYDAY SCENE AS STANIER B
Hornby superdetail LMS Stanier Black 5 8F Royal Scot Patriot Tender
