The Jackson tamper was introduced in
the 1950s on the Northern Pacific
Railway and continues in a new role
at the Northwest Railway Museum.
Vibrating work heads pack ballast
(rock) under the ties.
A hyrail excavator from RailWorks
installs a new stringer in one of the
Museum's bridges. Each timber is
9 inches x 18 inches and can be over
30 feet long.