121 (engine)

121 in Europe is a type of Locomotive to vapor whose axles have the following configuration (from the front to the back):

1 carrying Axle
2 axles engine
1 carrying axle

What is written:

2-4-2 in Whyte coding.
121 in coding of Europe.

; Network of Al: T 5 AL 2145 and 2146 of 1901, transformation into 121 of the 120 of origin.

; Company of the PLM: n°1 with 50 exits of engines 120 and n°51 with 110 with driving wheels of 2 m for express trains travellers on the imperial artery Paris - Dijon - Lyon - Marseilles. They were equipped with a hearth Belpaire and with a distribution Gooch.

; Company of PO: It is engineer Forquenot who developed the first engines PO with two Essieu X driving in 1875. To improve stability at high speed it added the carrying axle with the back and this configuration gave rise to a great number of successful engines which were built during 20 years as from 1876. These is undoubtedly the success which decided the PLM to be also equipped with such machines.

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