Workboots for Norfolk Southern - Trains Magazine

Right out of the rule book:

Protective footwear:

Upper portion must be constructed of leather or leather-like material that provides firm ankle support and fits snugly about the foot, ankle, and leg. Footwear must be 6 inches minimum in height as measured from the bottom of the heel to the top of the uppers. Soles and heels must be sturdy, non-leather and in good condition.

Must have a defined heel of no less than a 45-degree angle to the walking surface with a minimum height of 3/8 inches as measured between the bottom of the heel and the bottom of the sole.

It is recommended that employees whose duties regularly require ascending and descending ladders, poles, structures, and/or mounting and dismounting rail equipment wear protective footwear having a 90 degree heel as measured vertically between the bottom of the heel and the bottom of the sole.

They don't have to be any particular brand. Mine are in fact $49.95 Skechers work boots; I've worn them every day (even when not at work) for 2 years and they are still going strong. What they are saying about the defined heel is that they should have a nice sharp angle between the shoe and the heel...and since you'll be mounting and dismounting equipment, the front edge of your heel should be vertical (perpendicular to the rest of your sole).