Data communications over telegraph circuits 1940
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One of the other folks mentioned the central office "converters" that permitted some degree of interoperability between speeds, codes, etc. For some reason, I remember Telex ultimately remaining as 5-level Baudot using Teletype Model 32s with 3 row keyboard {and of course FIGS & LTRS keys} while TWX was 8-level ASCII using Teletype Model 33s with 4 row keyboard. Also Telex had its own unique numbering plan with fewer NPAs like 510, 710, etc.
Really digging into dusty memories, in the Erie PA area, ISTR you could dial a TWX machine from a regular POTS line by calling 814-453-6love where love were the final digits of its TWX number (or something like that, anyhow). This was probably an artifact of how TWX calls were terminated in the buttociated GTE local CO access switches.
Baudot hasn't been used for about a century. The five-bit code used by the deaf, radio hams, Telex, TWX, newsrooms, and the ASR-32 Teletype, is properly called Murray or...
Also, you should check out what WU called "Infomaster".....their mid 70s mainframe-based (IIRC) message switching system. Effectively, TWX could send to Telex and vice versa; although supported multiple destinations for a single message sent via Infomaster, etc. Would be interesting to learn more about it & its development.....not sure whether there's anything in the WUTR archives about that or not.
Sure wish I would've saved one of the big thick paper TWX directories, which had user's guide for Infomaster (and other info) in the front pages.