Best, and most effective calf movement I have ever done is donkey raises. Not an issue when you're younger, and have a training partner. It was the one movement that noticeably grew my calves. Without a training partner it's a no go. Few gyms have a donkey calf machine, and hanging plates from a belt can work, but from experience you need a lot of weight. My training partner was 250, and held a 120lb dumbell between his thighs.
Given issues with my low back it's not worth attempting. But, for younger guys, it works, and I tried everything. We had both a standing and seated calf machines, but what worked best were donkey raises.
Now, I did some running earlier this summer, until some nerve issues flared up, but in that short time I had a noticeable improvement in my calves. Same as when I was biking 20k 4 days/wk.
I wish I had received my old man's calf genetics. He never played sports or worked out, but still has great calves, despite being almost 70.