From the left 2 types of S-Bahn EMU Siemens RABe 514 RE450 The Loco looks like an RE420. But it looks like it’s attached to Dostos so could be modified- They have some sets than run with one at either end. Can‘t tell you what the shunter is, possibly an Ee922
No - The Arosa loco is 1 metre guage and belong to the RhB (Rhaetian Bahn). All the trains in the Photo are standard guage and belong to the SBB (Schweizerische Bundesbahnen).
Yep like said above tiger is right and I confirm the small shunter locomotive is an Ee 922 indeed. The locomotive next to it looks like a Re 4/4 ii
Re450 Re420 & EE922. EE922 usually works on Coach Yards equipped for 25kv 50 15kv 16.7hz while EE923 is the Freight Version of EE922 found in Chiasso Rbf Zurich Limmattal Basel Muttenz. French-speaking part Triage Lausanne Denges. You should be in Zurich area S-Bahn Italian speaking Part Tilo & RER in the french part CFF