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Yes. It is true to say that Classes 421 and 501 were Slam Door Trains.
The positive integer factors of 421 are: 1, 421
The only prime factor of 421 is 421.
0.421 as a fraction is 421/1000.It is 421/1000.
421 = CDXXI
500
421 + 136.25 = 557.25
421 is a prime number.
70.1667
6 x 421 = 2,526
421
52.625