Steam locomotive basics by external videos

Steam locomotive function: Big Boy - with many basic explanations but also some type specific details

Mass balancing - basic new concepts for standard and Mallet/Garratt designs

Preface: New balancing concepts - indispensable for up-to-date high speed capability
Practicable qualitative balancing for "two cylinder" engines - for significantly more maximum speed
Additional balancing of valve piston - for high speed locomotives
ACE 3000: Perfecting ACE 3000 balancing - only a theoretical plus?
Concept "SAS 3000": Going beyond ACE 3000 balancing - the basis for future steam on mainlines