S2103-08W Custom Weathered Class 5101 Large Prairie British Railways BR Black (Late Crest) 2-6-2 Tank Locomotive No.4156Exclusive to Rails of Sheffield The Class 5101 Large Prairie is the next locomotive in N from Sonic Models. Version: British Railways BR Black (Late Crest) 2 6 2 Tank Locomotive No. 4156 Sonic Models are offering the distinctive GWR BR 2 6 2 "Large Prairie" tank locomotive, as their next N gauge powered model. The model is being developed by Sonic Models. The models all feature a similar drive to Sonics popular GWR 56xx and forthcoming Class J50 as