We start out with an assortment of train shots from the same clapboard, Florey / Planer. Some are just the train, some have a car following it, and one even has an engineer climbing around on the train. Florey / Planer would be Robert Florey and Franz Planer. They did 2 movies together.. Meet Boston Blackie and The Man Behind the Mask. Hard to guess where these are from of course.
Next, we shift gears completely, we see a man (a dummy!) fall off a cliff! Weee! Clapboard on the bottom says "Morgan", hard to read what it says on top.
Next, a train arrives at a town called "Montside". A few people wait, conductor pulls a few pieces of luggage off. Ckapboard says Mate / Walker. This COULD be the duo of Cinematographer Rudolph Mate and Joseph Walker. They did 2 movies together, The Dark Past and No Sad Songs for Me. Hard to guess where this is from. even with the town name.
Next, another dummy falls, this time in an indoor apartment building, from a balcony. Clapboard here says Sirk / Lawton which tells us this is definitely "Shockproof" directed by yes, Douglas Sirk, and shot by Charles Lawton Jr.
Next, another dummy falls from a rocky cliff! Then we go back to cliffside and we see a real guy acting as if he's struggling to get back his footing on the cliff! No clapboard.
And finally an actual fight on a cliff! No falling, although a few rocks dislodge! Eek! No clapboard again.