Jancsi is part of a closely knit gang of young engineers. They see the older engineers as mediocre, and have grand ideas about developing new inventions together. With changing living conditions the five friends start to grow apart. At a party Jancsi suddenly meets Éva Halk. They fall in love, and find common memories in the engagement in The Pioneer Railway at the age of 12.
| Actor | Role |
|---|---|
 András BálintJancsi | Jancsi |
 Ilona BéresHalk Éva | Halk Éva |
 Judit HalászHabgab | Habgab |
 Kati SólyomAnni | Anni |
 Cecília EsztergályosÁgi | Ági |
| BBéla AsztalosLaci | Laci |
| TTamás ErössMatyi | Matyi |
| LLászló MurányiGergely | Gergely |
| IIstván DékányFüsi | Füsi |
 Miklós GáborFlesch fõmérnök | Flesch fõmérnök |
 Imre SinkovitsHarrer | Harrer |
 János RajzZsoldos úr | Zsoldos úr |
 István BujtorÁgi elsõ szerelme | Ági elsõ szerelme |
 Dorottya GéczyNõ a parton | Nõ a parton |
| FFredi HaberZongorista | Zongorista |