不及物动词的过去分词，可以作定语，只表完成，不表被动。一般都是单个的过去分词作前置定语，很少后置。不过，这时已经演变为分词形容词了。例如：
My mother is a retired nurse. 我妈妈是位退休的护士。
Look! There are fallen leaves everywhere. 瞧，到处都是落叶。
如果是不及物动词的过去分词短语作后置定语，应使用定语从句。所以，句1错误，句2正确，句3尽可能避免，因为很难把握这种后置定语：
1. The train arrived at Platform No.3 is from Shanghai.（误）
2. The train WHICH HAS arrived at Platform No.3 is from Shanghai.（正）
3. The train just now arrived at Platform No.3 is from Shanghai.（？？？）

当然，语言交流和表达趋于简练，确实有不及物动词（包括系动词）短语作后置定语的情况。例如：
We visted his hometown, grown prosperous and beautiful.
I have won the championship. It is just a dream come true.