There will always be more.
When I was a small child, my father had passed. I was sent to live with my grandma and grandpa in Buffalo for a while. There were parallel NYCRR tracks behind their house. Grandma was an invalid and had little she could do with me, on the other hand grandpa, seeing the fascination with trains taught me to feel the rumble long before the headlight.
I would wait at the fence, till around the bend came all the happiness I needed, the behemoths would shake my world. Grandpa would have me count every car, every train, grandpa knew how to occupy my restless imagination. Later he wanted car types, road numbers, loco's etc.
More than 60 years later, I still sometimes count my trains, but the numbers matter little; I know if I wait there will be more coming.