4S-041-014 OO Gauge Large Prairie 8100 BR Green Late CrestLocomotive background Information The 5101 class of large prairie locomotives were updated versions of the 3100 class and built between 1929 and 1939 which included the 6100 series, with a higher boiler pressure and designed for London suburban services. The final locomotives were built between 1946 and 1949 with the last twenty not receiving Great Western livery. General Specification Many original GA drawings were used in the development of these