Alright folks, countdown clocks...
The design we have chosen is a multicolor LCD screen manufactured by Solari and originally used by MTA New York City Transit. The screen has room for the next two arriving trains and a crawl on the bottom for various different announcements. Any recorded announcements will have the text scroll across the bottom row of the screen. In the lower left corner is the current time and temperature.
As you can see below, the abbreviation for the service on it's official color background is on the left hand side, with the destination in the middle and the time until it arrives on the right hand side.
When a train/trolley arrives, the countdown clock will reach zero. The entire top line (destination and time) become orange and will flash while the announcement for an arriving train/trolley plays over the PA system and scrolls across the bottom line.
For a station on a line with one common abbreviation but multiple variations in service patterns, such as the Market-Frankford line's rush hour skip stop service pattern or the Lindenwold Line's rush hour express/local service pattern, the countdown clock will show the common abbreviation in its usual rectangle and the letter that represent the pattern of that trip (A,B or C for the MFL and L or X for the LND) in a colored circle.
The three top images cover the usual operation of the countdown clocks but there is also contingency pattern for unusual scenarios.
The example below is for unusual reroutes over track that usually don't see that particular service. For the rerouted train (in this case a Lindenwold Line train rerouted to Girard via the Broad-Ridge Spur), the countdown clock will recognize the program currently in use on that train and the destination used in that program or the destination set by the RCC, whichever one is more accurate. In this example, the train is using the Lindenwold line program to Girard, so it appears as such. If it were to change over to the Broad-Ridge program, it would show up as BRS instead of LND. If the train was using the normal program to New Jersey with announcements turned off, then the countdown clocks would use the RCC data to determine that it is headed to Girard. Finally, the exclamation point denotes that this is an unusual train.
In the event that a train operates as a short turn, but was not scheduled to do so, then it will also have an exclamation point.
(See the Rittenhouse Square bound train in the below example)
And finally, services that are undergoing a planned service change will also have an exclamation point. Again, the clocks go by the program used on that train, so even though in this example, both trains are going to the same destination and making the same stops to get there, since one is signed up as a South Street-Glassboro train and the other is signed up as a South Street-Moorestown train, they show on the clock as such.