1. LOGGING RAILROADS are usually less than 30 or so miles long and
are used to haul timber from in the woods to the nearest branch of
another larger line. These roads use smaller locomotives, and many
times are narrow gauge.
2. INDUSTRIAL RAILROADS are used primarily in large industrial
plants. Smaller switch engines are used to relocate and spot carloads
of materials which were delivered to or will be picked up at the
interchange by another line.
3. BELT LINE RAILROADS are usually joint ventures of several larger lines and
are used to transfer carloads of material between yards of these lines.
Belt lines use a variety of engines from switchers to large road
types. Belt lines vary in length from a few miles to several
4. SHORT LINE RAILROADS are created by some large industries to connect from
the industry to the nearest Main line. Freight traffic, from other
industries on this line, are carried to the Main line. Short lines can
be a few miles or several hundred in length. A variety of engines are
used, often switchers running in multiple or the smaller road types.
5. TRANSFER RAILROADS are specialty types of operations generally used
to transfer freight traffic from the Short line or Main line to a
water based carrier such as ships or barges. Transfer lines are
usually very short, say less than 10 miles. A variety of engines are
used, switchers in multiple, road types or sometimes units designed
specifically for transfer duty.
6. MAIN LINE RAILROADS are those which move a variety of freight over long
distances and which have several branch lines connecting along the
way. Many main lines are transcontinental in operation and connect
to many other main lines at various points. All types of engines
are used, generally in multiple lash-ups.