Appendix D
Glossary of Technical Terms
ADA
Americans with Disabilities Act passed by Congress in 1990 ensuring egalitarian access to buildings, transit, and public services for people with disabilities.
BAT
Brockton Area Transit Authority
Bottleneck
An infrastructure element that lowers the capacity of other elements- for instance, a section of single track in an otherwise double-tracked line
Capacity (service)
The theoretical number of users that a particular system can serve in a given span of time
Capital investment
Money spent on durable elements of a system, not on day-to-day operations
Clockface (scheduling)
Scheduling in which trains (or buses) repeat precisely every fixed interval. For example, if an inbound train leaves your station at 9:50 am under a 20-minute clockface schedule, then an inbound train will leave your station at :10, :30, and :50 every hour making the exact same stops.
Construction cost
The cost to build or implement new infrastructure
Corridor (rail)
Right-of-way in which a train operates
DMU
Diesel Multiple Unit, a train that runs using diesel engines to self-propel each individual railcar.
Double track
Having 2 tracks, enabling inbound and outbound service to use separate tracks; adding a second track means trains going one direction don’t have to wait for trains going the other direction, which greatly constrains capacity and can often exacerbate delays
Dwell time
The amount of time a train spends at the station platform Electrification Building of electric power infrastructure along rail corridors
EMU
Electric Multiple Unit, a train that runs on electric power to self-propel each individual railcar
FMCB
Fiscal Management Control Board (of the MBTA)
FLIRT
A common model of EMU made by Stadler Rail
Frequency (of service)
How often service arrives
FRIP
Freight Rail Improvement Project
Full accessibility
Complete compliance with ADA and local guidelines enabling persons with a range of disabilities to have universal access to transit modes
Gateway Cities
“Mid-size urban centers that anchor regional economies around the state,” facing “stubborn social and economic challenges,” while retaining “many assets with unrealized potential” as defined by the Brookings Institution & MassINC
GATRA
Greater Attleboro Taunton Regional Transit Authority
High-level platform
Platform that is raised to meet the level of the entrance to a train, so as to enable level boarding
Infill stop
A new train stop that is built between two existing stops
Intercity rail
A rail network in which multiple cities are connected to each other with frequent rail service
Layover
Time spent by a train stationary at a terminal station or in a yard
Level boarding
Boarding a train at the same level as the platform with no barriers or steps, enabling full accessibility between the platform and the train; this can be installed as part of ADA accessibility, but is also a feature of some inaccessible stations (such as inaccessible subway stations)
Low-level platform
A platform which is at the same level as the tracks, requiring riders to walk up steps to enter a train. Lowlevel platforms are not ADA-compliant
MAPC
Metropolitan Area Planning Council
MBTA
Massachusetts Bay Transportation Authority
Metro(politan) Boston
Area roughly equivalent to the MBTA service area covered by existing Commuter Rail service, as defined by MAPC
Mini-high platform
A high-level platform, about two-thirds of a car long, that is constructed at a station with an existing low-level platform to enable level boarding for persons with disabilities
Mode share
The proportion of users in a corridor who travel by a given mode of transport
NEC
Northeast Corridor, the electrified rail corridor currently in use by the Providence Line on Commuter Rail as well as Amtrak service between Boston & Providence
NSRL
North-South Rail Link, a 2-mile tunnel connecting North & South Stations currently being studied by MassDOT
Operating cost
The cost to run rail service Peak service Service during “rush-hour” periods, roughly between 6-9 AM and 4-7 PM
RATP
Régie Autonome des Transports Parisiens, a state-owned public transport operator in France operating the Paris Metro and many other public transit services in the Paris region
RER
Réseau Express Régional, a hybrid suburban commuter/rapid transit system serving Paris, France and its suburbs
Right-of-way
The physical space dedicated to a railroad, highway, or other transportation corridor
RIPTA
Rhode Island Public Transit Authority
Rolling stock
Vehicles used on a railroad
SEPTA
Southeast Pennsylvania Transportation Authority
Single track
Having 1 track, meaning that inbound and outbound service have to share a single track, thus hindering service frequencies
SNCF
Société nationale des chemins de fer français, France’s national state-owned railway company, which operates rail service throughout the country
South Station Expansion
A plan currently being considered by MassDOT which would expand the South Station stub-end terminal to 20 tracks, with an estimated cost of $2 billion dollars. If built, the expansion would hinder the potential to implement regional rail service.
Timed-
When two trains are scheduled precisely to be at a specific place for any of the following purposes:
Meet - When two trains in opposite directions on a mostly single-track line are timed to pass each other on a short double-track segment
Overtake - When a slow and a fast train in the same direction are timed so that the fast train will overtake the slow train on a segment with passing tracks (often four tracks on a double-track line)
Transfer - When two trains, in any direction, are timed to stop at a station at the same time, allowing passengers to connect between them, typically across the same platform
TOD
Transit-oriented development, a development centered around public transit, often featuring higher density and less parking than the surrounding community
Walkable neighborhood
A neighborhood in which everyday commercial and social trips can be achieved by walking, often in conjunction with public transit