6: Thompson B1 Class (Irwell Press, 1994) Vol. 7: B12 class (Irwell Press. 1994) Vol. 8: Gresley K3 & K4 Classes (Challenger Publications, 1995) Vol. 9: Gresley 8-Coupled Engines - Classes O1, O2, P1, P2 & U1 (Challenger Publications, 1995) Vol. 10: Gresley D49 & J38 Classes (Challenger, 1996) Vol. 11: Gresley J39 Class (Challenger, 1996) Posthumous Vol. 12: Railcars & Sentinel Shunters (Challenger, 1996) Vol. 13: Class C1, C2, C4 & C5 Atlantics (Challenger, 1998) Vol. 14: Class D13, D15 & D16 - the Great Eastern 4-4-0s (Challenger, 1999) Vol. 15: Class J94, O6 & O7 - the Engines from the Years of Expediency (Challenger, 1999) Vol. 16: Class L1, V1 / V3 - Gresley & Thompson Six-coupled Tanks (Booklaw/Railbus, 2000) Vol. 17: Class B13, B14, B15 & B16 - the North Eastern 4-6-0s (Booklaw/Railbus, 2000) Vol. 18: Gresley K1 & K2, Thompson K1/1 & Peppercorn K1 (Booklaw/Railbus, 2000) Vol. 19: Class D1, D2, D3 & D4, & the M&GN 4-4-0s (Booklaw / Railbus, 2001) Vol. 20: Class Q1, Q2, Q3 & Q4, & The Q1 Tank Vol. 21: Class A5 to A8, H1, H2, L1 (L3), L2, M1 & M2 Tank Engines (Booklaw/Railbus, 2001) Vol. 22: Class B1 (B18) to B9 - the Great Central 4-6-0s (Booklaw/Railbus, 2001) Vol. 23: Class Q5, Q6, Q7 & Q10 - the North Eastern 0-8-0s (Booklaw/Railbus, 2002) Vol. 24A: Class O4/1 to O4/5 (Booklaw/Railbus, 2002) Vol. 24B: Class O4/6 to O4/8, O5 & Thompson O1 (Booklaw/Railbus, 2002) Vol. 25: Class N1 & N2 Tank Engines Vol. 26: Class J31 to J37 - the NBR 0-6-0s Vol. 27: Class N7 Vol. 28: Class R1, S1, T1 & WM&CQ 0-8-0T - The pre-Group 8-coupled tank engines Vol. 29: Class D5, D6, D7, D8, D9, D10, D11/1 & D12 - the Great Central 4-4-0s Vol. 30: Class E1, E2, GC 12A, E4, E5, '901', '1440', E7 & E8 - the 2-4-0s Vol. 31: Class C6, C7, C8, C9 - the North Eastern Atlantics Vol. 32: Class X1, X2, X3, X4, Y2, Y4, Y5, Y6, Y7, Y8, Y9, Y10, Z4 & Z5 Vol. 33: Class C12, C13, C14 & C17 Vol. 34: Class D17, D18, D19, D20, D21, D22, D23 & D24 Vol. 35: Class J14 & J15 Vol. 36: Class F1, F2, G1, G2, G3, G4, G7, G8, G9 & G10 Vol. 37A: Class J1, J2, J3 & J4 Vol. 37B: Class J5, J6, J7,