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Overhead Contact System (OCS)

An overhead line or overhead wire is used to transmit electrical energy to trams, trolley buses or trains.


The lower slab at the base of a column.


Potholing is an operation prior to start construction in order to confirm elevations of existing utilities in the area of the work.  A potholing truck will vacuum dirt out of a small area in order to expose the utility line.

Rail Tub

Rail tubs are precast concrete panels which will be used on this project to at locations where the rail crosses roadways


The underside of an arch or architrave (whether supported by piers or columns)


Stormwater Pollution Prevention Plan. A SWPPP describes all of the construction site operator’s activities to prevent stormwater contamination, control sedimentation and erosion, and comply with the requirements of the Clean Water Act.

TPSS (Traction Power substation)

traction substation or traction current converter plant is an electrical substation that converts electric power from the form provided by the electrical power industry for public utility service to an appropriate voltage, current type and frequency to supply railways, trams (streetcars) or trolleybuses with traction current.


An open braced framework used to support an elevated structure such as a bridge.