General description and facilities
Taken from - ENGINEERING INSTRUCTIONS, TOOLS & TRANSPORT, VEHICLES, N 3060 (Issue 1, 23.11.68)
Emergency snow vehicle unit Aberdeen
How to deal with snow
The Snow Emergency scheme is a comprehensive national one, justified by the growing multiplicity of high revenue earning stations, particularly Microwave Radio Stations, located on remote sites. Its guarantees of service are:-
(1) Access within 24 hours to deal with urgent faults.
Each Snow Emergency Unit comprises a snow vehicle - the Snow-Trac - on a transporter trailer towed by a Land-Rover and it is always accompanied by a specialist snow vehicle driver. The unit moves into the snow belt as far as possible by road before the Snow-Trac is unloaded; this reduces the distance to be traversed by the relatively slow moving snow vehicle (top speed 15 m.p.h.).
No engine freezing problem here as it has a 1200 c.c. air cooled engine unit. The vehicle's dimensions are, length 12 ft., width 6 ft. 3 in. and height 6ft. 3 in.
The Snow-Trac is a fully tracked vehicle of relatively light construction-22 cwts. unladen and with the driver on board exerts a pressure on snow of only 0.75 lb. per square inch, which means that it leaves an impression of a little more than 1 in. deep in soft snow. It will carry a load of to cwts. and can tow a further 10 cwts. The tracks are twin fabric reinforced rubber bands with metal cross pieces which take the drive via forward mounted cog wheels; the other 14 wheels are rubber shod. The method of steering is by variation of the gearing to the individual tracks, giving a turning circle of only 8 ft. 3 in.
Within the cab the controls have the conventional look of car controls with steering wheel, gear lever - four forward speeds plus reverse - accelerator, foot-brake and clutch, although the driving technique is somewhat different. Sitting high behind the front-mounted engine, the driver has a splendid view and can see the ground very close to the nose which is an important point in keeping a sharp look out for protruding rocks that could damage the tracks. Its progress is relentless, up, down or across steep slopes and it is only likely to be defeated by hard icy slopes at approximately 45 degrees.
Not only does this vehicle have excellent performance in snow under the most awkward conditions, it is equally at home on a heather clad hill-side, marshy ground or rough tracks; thus it has uses for exceptional access problems outside the snow season.
There are many Snow-Tracs operating in remote districts, by concerns other than the Post Office and the snow emergency scheme allows for the friendliest possible co-operation with such operators in time of emergency.
Last revised: October 28, 2019