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From 1939 thru 1947, M-M grouped all the different types of R's together (not separate serial number sequences) From 1948 thru 1955, all R's serial numbers were
separate sequences for the different types of R's.
RTU - Tricycle front end
RTS - Fixed wide front axle
RTI - Industrial fixed wide front axle
RTN - Single front wheel
RTE - Adjustable wide front axle
R serial numbers:
400001-402200 RT 1939
402201-405575 RTU RTS RTN RTI 1940
405576-407950 RTU RTS RTN RTI 1941
407951-408819 RTU RTS 1942 408826-409357 RTU 1943 409358-410747 RTU RTS RTN RTI 1944 410748-413754 RTU RTS RTN RTI 1945 413755-416544 RTU RTS RTN RTI 1946 416545-422057 RTU RTS RTN RTI RTE 1947
0014800001-0014802402 RTU 1948 0014900001-0014903039 RTU 1949 0015000001-0015002155 RTU 1950
00102156-00103972 RTU 1951
00103973-00104823 RTU 1952
00104824-00104831 RTU 1954 0034800001-0034800100 RTN 1948 0034900001-0034900200 RTN 1949 0035000001-0035000093 RTN 1950 00300094-00300173 RTN 1951 0044800001-0044800501 RTE 1948
0044900001-0044900315 RTE 1949
0045000001-0045000204 RTE 1950
00400205-00400281 RTE 1951 00400282 only RTE 1952 00400283-00400287 RTE 1953 0024900001-0024900374 RTS 1949
0025000001-0025000300 RTS 1950 00200301-00200401 RTS 1951 00200402-00200551 RTS 1952 00200552-00200701 RTS 1953 0054800001-0054800700 RTI 1948
0054900001-0054900450 RTI 1949
0055000001-0055000115 RTI 1950 00500116-00500598 RTI 1951 00500599-00501000 RTI 1952 00501001-00501010 missing from listings 00501011-00501311 RTI 1953 00501312-00501511 RTI 1954 00501512-00501579 RTI 1955
05500001-05500249 RTI-M (MILITARY) 1953
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