That numbering convention, introduced in 1946 did not stay intact long. For example there were no choo choo only postwar engines made, so a 321 had either nothing or smoke and choo choo. The 321 number was dropped, as was the 320 by 1948. The 300 continued in production. The 290 issued in 1949 should have been a 292 if the convention was followed. The last digit of 5 was then used in the link coupler era to denote a tender whistle in addition to smoke and choo choo, such as a 295 or 325AC. The last digit significance was changed/abandoned with the arrival of knuckle couplers. The 302 with a knuckle coupler became a 303.
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