Preemption of Traffic Signals Near Railroad Crossings, 2nd Edition, ITE, 2021 (ITE manual) provides excellent guidance for pre-signals or queue cutter signals. Further guidance on selecting queue prevention strategies is presented in Chapter 6 of this manual. When filling out TxDOT Form 2304 and the design proposes a pre-signal:

Preemption calculations should include the CSD to take account for any motorists that may have violated the pre-signal. However, the designer may omit the CSD, or a portion thereof, if needed to reduce the advance preemption time such as to comply with the AREMA 50 second rule.

When filling out TxDOT Form 2304 and the design proposes a queue cutter signal:

Preemption calculations should omit the CSD since the adjacent intersection is far enough away from the grade crossing that vehicles will be able to safely queue within the CSD. The queue cutter will provide on-track queue prevention within the MTCD.
RWTT should be limited to minimum green, yellow change and red clearance time.
The advance preemption time should provide enough time to transition to the queue cutter to red prior to the activation of the railroad flashers. The queue cutter signal all-red indication should synchronize with activation of the railroad flashing lights.