记忆像铁轨一样长
[jì yì xiàng tiĕ guĭ yī yàng zhăng]
In literal translation, it's like 'memories are as long as railway tracks', metaphorically saying memories extend endlessly just like railways. Usually conveying nostalgia, it depicts someone looking at the unbroken line of past experiences that have passed before them as they look down a stretch of iron road leading far away.