Turnout and crossings terminology: Which arrangement of rails allows a train both to cross another track <em>and</em> to be diverted to that other track from the same location?

Introduction / Context:
Complex track layouts enable crossing and routing flexibility in constrained yards and station throats. Understanding the capability of each arrangement is essential for operations and design.

Given Data / Assumptions:

• We compare diamond crossings, slips, and crossovers.
• The desired function is both crossing and diverging to the intersecting track at one location.

Concept / Approach:
A plain diamond permits only crossing. Adding slips inserts switch diamonds that enable a route from one track to the other. A single slip allows diversion in one of the two diagonal directions, whereas a double slip provides both directions, maximizing flexibility within the diamond footprint.

Step-by-Step Solution:
Identify plain diamond: crossing only.Add one slip (single slip): allows crossing and one-direction turnout.Add two slips (double slip): allows crossing and diversion to the other track in both directions.

Verification / Alternative check:
Track schematics show the double slip has four switch tongues integrated into the diamond, offering full flexibility.

Why Other Options Are Wrong:

• Diamond crossing: no turnout function.
• Single slip: only one-direction diversion.
• Cross over: two separate turnouts allowing a train to transfer between parallel tracks, not at the intersection of two crossing tracks.
• Scissors crossover: compact pair of crossovers between parallel tracks, not a crossing of intersecting tracks.

Common Pitfalls:
Confusing crossovers between parallel tracks with slip arrangements inside a crossing; assuming any diamond allows turnouts without slips.

Final Answer:
diamond crossing with double slip