"construction in which rails form an important part," early 15c., verbal noun from rail (v.2). Technically, railings (late 15c.) are horizontal, palings are vertical.
权威例句
1. There was a splintering sound as the railing gave way.
围栏倒下时发出了断裂的声音。
2. He felt the hardness of the iron railing press against his spine.
他感觉到硬邦邦的铁栏杆顶着自己的脊梁。
3. He leant against the railing, his breath coming in short gasps.
他倚着栏杆, 急促地喘气.
4. He's always railing against his wife about her extravagance.
他总是责怪妻子奢侈浪费.
5. Tom took his seat again and lifted his feet up on to the railing.