Movable Point Frog refers to:

• A. Hand-Operated Switch
• B. Movable Point Frog
• C. Marker
• D. Interlocking Station

Answer: (B)

A movable point frog describes the turnout component where the rails guiding the wheels—the points—are mounted on a moving section that slides to align with the chosen route, and the frog crossing itself moves with them. This setup provides a smooth, aligned path for wheels entering the turnout from either direction. It’s a specific type of switch feature, distinct from a hand-operated switch (which is just the manual act of switching), a marker (a trackside indicator), or an interlocking station (a signaling/control facility). The term itself identifies this particular moving-rail assembly, making it the best answer.