Source Engine: How to find certain animations, textures, etc?

As I'm making maps on the Hammer editor, I'm looking for certain animations that I have seen in Half-Life 2. However, to find the exact animation in Hammer is sometimes extremely difficult.

In either HL2, Garry's Mod or somehow Hammer itself, how could I find animations that are playing? This could also relate to entities, models and textures.

One example is I'm looking for the animation of the lady in the trainstation in HL2 where she holds onto the fence (this is near the very beginning). I know exactly what the animation looks like, but I can't find it in Hammer.

You can find out the name of a sequence an NPC is executing in game by using ent_text: turn on sv_cheats 1 and developer 1, then point at the NPC and run ent_text in the console. One of the values displayed on screen will be Sequence which will contain the animation name.