High freqency radio, telephone and teletypewriters were far more useful for railroad use in transmitting reports, information, etc. So by the end of the Big Depression, or at least by 1940 Morse telegraph had been entirely replaced by some system of telephones, even in train dispatching, on all but the smaller railroads or branch lines of larger ones.
About 1948 the Rio Grande either devised or copied a method of using its wires on the Creede Branch where a telephone "jumped" to the wires by radio and the message, etc. traveled to the Alamosa Relay Office (AS) and the train dispatcher (RM) over the wires. Telephones were in use from all Narrow Gauge offices still open as points of communication. Actually it was only an improved type of the telegraphone but it did work well. On our Main Lines, for train dispatching, Morse was GONE - the Morse instruments were removed there except at any office from which trains on Branches were dispatched. On many of these a system was set up so trains operated under Yard Limit Rules without any form of train orders. Samuel F.B. Morse's (and its predecessor Hill's printing wheel in England) telegraph had come a far ways in a century, but both were well on the way to becoming anachronisms. The old boomer operator in his black sateen sleeve guards, personal "Bug" (Vibroplex), stub of indelible pencil and tobacco juice stains at his left shirt pocket was also way out of date. (Operators working at Relay Offices of railroads, or commercial ones just before going on duty rolled up a cone of several thicknesses of paper and stuck it in their left shirt pocket to be used as a "spittoon" to receive the juice of the Redman or Beechnut chewing tobacco.)
Epilogue
The computer and its constant improvements made possible by the "chip" came so rapidly, that one generation soon was replaced by a new , better one - so many "Whiz Kids" coming up with incredible new ideas that work: Somewhere in all this the Telegrapher, keys, Vibroplexes, relays, quadruplexes, sounders - and gravity cells became just another phase of history. All the instruments and gadgets of telegraphy are now museum displays, their use explained, but the fact that the world's advances can be traced directly to them is not part of the display. Also overlooked is the prime factor in their use, the TELEGRAPHER. Without the men and women who learned the new language of dots and dashes; developed the requisite manual dexterity to transmit information by manipulating a key or Vibroplex, the techniques of telegraphy would have been just another toy for amusement.