[R-390] Anyone know what this is, Probably NOT R-390A

[Richard M. MC Clung]

Loading Coil C-114 
An 88 millihenry loading coil, with DC resistance of 8.4 Ohms, 
weight approx. 3l bs, having a waterproof phenol plastic case.
Coil C-114 is used at 1-mile interval on wire W-110-B and at 
5/8 mile intervals on wire W-143 to extend talking range.
RICH  WA6KNW

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Hi All;
Can someone here either direct me to a site or knows what this device

is used for or associated with. It is made by Lionel, C-114-A, Coil,
loading. I know what the model is, hi, but would be nice to know what
actual military unit it was used with.Many WWW searches really found
nothing. Any help will be appreciated.