Absolutely Sir.
In the Panel-A of the Driver's Cab of WAP-7 there is an indicator which is known as LSHO. If it Lit it means "the Hotel load contactor is closed and the loco is supplying power to the train". Please see the attached image of Panel-A with it's detailed description of the Switches and indicators. I mark the LSHO Indicator for your understanding.
Description about Panel-A switches of WAP-7:
LSDJ:To...
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indicate status of Main Circuit Breaker;
LSHO:Lit if the Hotel load contactor is closed and the loco is supplying power to the train;
LSP:To indicate wheel slipping/skidding;
LSAF:To indicate excess air-flow in brake-pipe;
LSVW:To indicate vigilance warning-lights up if the vigilance conditions are not met in the stipulated time(60 seconds);
BPVR:Push-button vigilance reset;
BPPB:Push-button parking brake;
BPCS:Push-button Constant-speed control;
ZBAN:To enable banking mode(isolates the train brake system in banking loco);
ZTEL:Tractive Effort Limitation:limits the maximum tractive/braking effort of the loco on vulnerable tracks like bridges;
BLHO:To close hotel load contactor and start supplying power to the train;
BLCP:To start compressors;
BLDJ:To close/open DJ;
ZPT:To raise/lower pantograph.
The key is used to activate the cab;
LSCE lights up to indicate excess temperature in machine room.
Emergency Stop button is self-explanatory.
Image Link : click here
Courtesy: Khalid Kagzi
The outside structural difference between a HOG and normal WAP-7
Pic of a Normal WAP-7
Courtesy: Sujeet Mishra
Link: click here
Pic of a HOG WAP-7
Link: click here
Courtesy:Anindya Ray