EMS
The name of Wabtec’s EMS.
Trip Optimizer
This is the world’s largest railroad classification yard.
Bailey Yard
System software and track data update.
warmstart
Measures MPH (miles / hours) from origin Train Departure (TD) to final Train Arrival (TA).
Train Speed (mph)
To prevent trains from colliding, PTC uses this system of centralized servers that exchange movement authorities with locomotives via wireless networks,
Back Office Server (BOS)
This software runs between an EMS and the locomotive control system.
Locomotive Command Control Module (LCCM)
This subdivision has the longest tunnel on the UP network.
Moffat Tunnel
This dispatching software transitioned into CADX.
CAD 2.5
Measures locomotive dwell in hours between trains
Locomotive Dwell TA-TD
This term describes the ability of trains from different railroads to safely operate on shared track using the same PTC system.
interoperability
New Trip Optimizer versions only support this hardware.
TMC5/CPU1900
This Locomotive weighs 1.2 million pounds and is 133 feet long.
Big Boy No. 4014
The acronym CAD stands for this.
Computer Aided Dispatching
Measures the hours a car spends connecting between trains at a UP terminal.
Freight Car Dwell Hours
In addition to GPS, PTC depends on this dedicated band of radio spectrum—leased from the FCC—for locomotive-to-wayside and locomotive-to-server communication.
220 MHz
EMS auto-engaged train miles in August 2025.
~4.9M
UP recently celebrated this many years on the New York Stock Exchange.
155
Time the weekly Tuesday CADX warmstart usually occurs at.
10:10c
Measures if a car was spotted or pulled on-time according to the car schedule
First Mile Last Mile (IS&P)
PTC can enforce speed limits on curves like the one where Amtrak 188 derailed in 2015 near this major U.S. city.
Philadelphia
The average engaged miles EMS travels per disengagement.
~20 miles
In 1936, UP engineers developed this device to move people faster and safer up mountain slopes.
Ski Chairlift
This California based railroad uses CADX.
ABL (Alameda Belt Line)
% of cars that meet the car scheduling plan at a terminal
Car Connection Performance (USES)
Because of cybersecurity concerns, PTC messages are encrypted and authenticated using these types of digital safeguards.
cryptographic (or HMAC) keys