diff -urN wf-/wf_ex.c wf/wf_ex.c
--- wf-/wf_ex.c	2016-01-06 00:00:00.000000000 +0900
+++ wf/wf_ex.c	2016-01-07 00:00:00.000000000 +0900
@@ -384,7 +384,7 @@
 			{ type_end } }},
 		    .data = spin_ball }};
 
-		double a = 10, b = a*2;
+		double a = 20, b = a;
 		struct way *rail = &(struct way){
 		  .n=20, 
 		  .ps = (pos_t[]){
@@ -392,14 +392,18 @@
 		    {a+b+b,a+a+a,0},{a+b,a+a+a,a},{a,a+a+a,a},{0,a+a,a},{a,a,a},
 		    {a+b,a,a},{a+b+b,0,a},{a+b+b+b,0,a},{a+b+b+b+a,a,a},{a+b+b+b,a+a,a},
 		    {a+b+b,a+a,a},{a+b,a+a,0},{a,a+a,0},{0,a,0} },
-		  .ts=(double[]){ 3,4,3,1,1, 1,2,1,0.5,0.5, 3,4,3,1,1, 1,2,1,0.5,0.5 },
+		  .ts=(double[]){ 2,3,2,3,3, 1,1.5,1,1.5,1.5, 1,1.5,1,1.5,1.5, 2,3,2,3,3 },
 		  .vs=NULL, .dg=3 };
 
 		data_t *train = &(data_t){ type_op_data_set, &(struct op_data_set){
 		  .op = &(data_t){ type_arr, (data_t[]){
+		    { type_copy_timeshift, &(struct copy_timeshift){
+		      .n=3, .init_sec=0, .step_sec=1, .init=D3_O, .step={0,0,-a*0.5} }},
+		    { type_copy_timeshift, &(struct copy_timeshift){
+		      .n=2, .init_sec=0, .step_sec=8, .init=D3_O, .step=D3_O }},
 		    { type_slide, &(d3_t){0,-4*a,0} },
-		    { type_train_way, &(struct train_way){.n=6, .len=4, .len2=4, .way=*rail} },
-		    { type_zoom_and_slide, (d3_t[]){ {1,4,1},{0,-2,0} } },
+		    { type_train_way, &(struct train_way){.n=6, .len=4, .len2=8, .way=*rail} },
+		    { type_zoom_and_slide, (d3_t[]){ {1,6,1},{0,-2,0} } },
 		    { type_end } }},
 		  .data = &(data_t){ type_cube } }};